We humans evolved on Earth, we are shaped to cope with its environment and external factors that the planet is endowed with.
Earth, or Terra as it is also called, naturally suits our basic needs, it has breathable air, drinkable water, it is not to hot or to cold and there is an ecosystem that provides us with food.
But what if we were to live on another planet, or moon, would we need to change ourselves (genetics modification?), or our environment (terraforming) to better suit our needs?
Life Noggin made this animated short on how we could convert a planet like Mars or Venus, or a moon like Europa, into a second Earth.